Patients and staff members were evacuated from the building with their hands held over their heads.

Coady says the building, which houses about 40 medical practitioners, was evacuated but that the main hospital remained open.

Daly City Police Lt. David Mackriss told the San Francisco Chronicle that a doctor reported seeing a gunman and hearing gunshots. But after a search, no victim or suspect was found, and investigators declared the building clear just before 5 p.m.